How long ago did air pollution becom a widespread problem?

Answer 1

Actually, air pollution (as we know it today) has improved over the last century.

Coal, steel, and industries that burned fossil fuels to produce their products used to emit such heavy smoke and toxins into the air that areas looked covered in fog, but it was vapors of pollution trapped near the ground. This continued at least into the 1970s in many areas. Then, governmental entities enacted Clear Air acts and penalties against polluting industrustries. Some countries though still have considerable pollution (ex. Asian countries) because they still rely on coal, which is one of the most available fuels worldwide.

Historically and currently, though, volcanic eruptions still contribute to air pollution. The summer of 1814 had snow, failed crops, and many deaths because of a volcano that erupted half-way across the world. Volcanic dust can affect large areas, travel on air currents, and affect air quality, weather, and the health of crops and persons.

Answer 2

During the 1700s